D tosi om_fbg

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University of Limerick - Politecnico di Torino - presentation for Optical Metrology 2013, Munich - FBG paper.

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D tosi om_fbg

  1. 1. High-Frequency Optical Fiber Microphone forCondition-Based Maintenance (CBM) Application[Optical Metrology, 2013]Daniele TosiUniversity of Limerick, Optical Fibre Sensors Research CentreMassimo Olivero, Guido Perrone, Alberto VallanPolitecnico di Torino, Dept. of Electronics and Telecommunications
  2. 2. Fiber optic microphoneHigh-frequency optical fiber microphone for condition-based maintenance applicationPerformance➡ , n , <n sensing resolutionμε ε ε➡ Long-haul sensingMiniature size➡ Miniature size ( 125 m + coating)∅ μ➡ Lightweight, versatile coatingDistribution➡ Time+wavelength multiplexing➡ Quasi-distributedTotal immunity➡ Totally EMI compatible➡ Fire-safe, passive device
  3. 3. Fiber Bragg grating (FBG)High-frequency optical fiber microphone for condition-based maintenance application•Information encoded inFBG optical spectrum•Linear dependance onstrain and temperature•1.08 pm/με (10.2 pm/K)•High-speed interrogation•Information encoded inFBG optical spectrum•Linear dependance onstrain and temperature•1.08 pm/με (10.2 pm/K)•High-speed interrogationReflected Bragg wavelength shifts linearly with variation oftensile strain and temperature
  4. 4. High-speed interrogationHigh-frequency optical fiber microphone for condition-based maintenance applicationHigh speed, no scanning elementsShort range, high sensitivitySensitive to backreflection noise
  5. 5. Signal processingHigh-frequency optical fiber microphone for condition-based maintenance applicationAdaptive filtering•Mitigates the effectof backreflectionlaser noise•Applied in pre-training conditionsFrequency estimat.•Operate in lowSNR, well below-35 dB•Computationalcomplexity increaseHigh sensitivity, 0.1 n≲ εNo real-time detection
  6. 6. FBG multiplexingHigh-frequency optical fiber microphone for condition-based maintenance application...............FBG matrixchannel 1channel 2channel N...wavel. Wwavel. 2wavel. 1
  7. 7. ArchitectureHigh-frequency optical fiber microphone for condition-based maintenance applicationSwitchLaser arrayLasercontrollerPhotodiode...............FBG matrix...
  8. 8. PrototypeHigh-frequency optical fiber microphone for condition-based maintenance applicationLaser(s)DetectorSwitch 1x2CirculatorTEC/LDCFiber outputDAQ outputDAQ 5kS/s
  9. 9. Frequency responseHigh-frequency optical fiber microphone for condition-based maintenance application
  10. 10. Voice detectionHigh-frequency optical fiber microphone for condition-based maintenance applicationIntelligibility + peak reproduction
  11. 11. CBM Condition-Based MaintenanceHigh-frequency optical fiber microphone for condition-based maintenance application
  12. 12. CBM Condition-Based MaintenanceHigh-frequency optical fiber microphone for condition-based maintenance application
  13. 13. CBM Condition-Based MaintenanceHigh-frequency optical fiber microphone for condition-based maintenance applicationEMI-prone environmentCritical location placementNoisy environmentNetwork structureLong process time
  14. 14. CBM modelHigh-frequency optical fiber microphone for condition-based maintenance applicationAhmadi, H. and Mollazade, K., "Bearing fault diagnosis of a mine stone crasher byvibration condition monitoring technique," Res. J. Appl. Sci. Eng. Technol. 1 (2009).Sound = f(shape) ++ f(rotation/contact) ++ f(damage)Warning signal (fm)
  15. 15. CBM modelHigh-frequency optical fiber microphone for condition-based maintenance applicationAhmadi, H. and Mollazade, K., "Bearing fault diagnosis of a mine stone crasher byvibration condition monitoring technique," Res. J. Appl. Sci. Eng. Technol. 1 (2009).
  16. 16. CBM modelHigh-frequency optical fiber microphone for condition-based maintenance applicationAhmadi, H. and Mollazade, K., "Bearing fault diagnosis of a mine stone crasher byvibration condition monitoring technique," Res. J. Appl. Sci. Eng. Technol. 1 (2009).Useful region
  17. 17. Future workHigh-frequency optical fiber microphone for condition-based maintenance applicationFBGsShakerCFC(4 layer)

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